196 ZOOGENETES. 



lated labial processes and very short inferior tentacles. Vivip- 

 arous. 



There is only one well-known recent species of Zoogenetes, 

 the Japanese Z. harpula being unfigured and referred to this 

 genus with considerable doubt. 



The distribution of Z. harpa is remarkably discontinuous, 

 the Swiss, Scandinavian, Transcaspian and east Siberian herds 

 being widely separated. In America the scattered colonies 

 south of Maine appear to be very small and isolated. 



Morse spelled the name Zoogenetes on page 5 of his memoir, 

 and in the first and second references on page 32, but then 

 wrote the species "Zoogenites harpa." We use his first spell- 

 ing, which has already been preferred by Lindholm. 



Zoogenetes harpa (Say). PI. 32, fig. 10. 



The shell is narrowly umbilicate, ovate-conic, thin, somewhat 

 transparent, olive-green, rather glossy, early whorls nearly 

 smooth, the last two with sculpture of delicate, well-spaced 

 cuticular riblets or laminae in the direction of growth-lines, 

 about 30 on the last whorl, becoming crowded toward its end. 

 Summit obtuse. Whorls nearly 4, rounded. Aperture ob- 

 lique, ovate, the lip thin and simple, dilated at the axial ter- 

 mination. Length 3.25, diam. 2.5 mm. 



Massachusetts, Maine and Prince Edward Island west to 

 Minnesota, Hudson Bay and Alaska; Kamchatka and the 

 lower Amur valley; northern Scandinavia; Finland; and 

 Peterhof in the Baltic Prov. of Eussia; Horei-Vor on the 

 Kolva River, Archangel Government; southern Switzerland; 

 Askhabad, Transcaspia. 



Helix harpa Say, App. Long's Exped., ii, 1824, p. 256, pi. 

 15, f. 1. — Binney and Bland, Land and Freshwater Shells N. 

 A., i, p. 156, f. 266-269 (Gaspe; New Hampshire; English 

 River, Manitoba; James Bay). — Westerlund, Fauna, i, 1889, 

 p. 17 ; Vega Exped. Vet. Arbeten, iv, p. 149, 152, 159, 160, 

 162, 170, 171 (Chuckchi Peninsula; Konyam Bay, eastern 

 Siberia; Bering Island, etc.). — Craven, Journ. de Conchyl., 

 1888, p. 101 (Riffelalp near Zermatt, Switzerland, 2100 meters 

 under fallen bark of Pinus pinea). — Schlesch, Hull Museum 

 Publications No. 112, 1917, p. 166, text-fig. (localities in Nor- 



